CN110789466A - Marine snail-based bionic gradient porosity microstructure automobile inner front wall acoustic package structure - Google Patents
Marine snail-based bionic gradient porosity microstructure automobile inner front wall acoustic package structure Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R13/00—Elements for body-finishing, identifying, or decorating; Arrangements or adaptations for advertising purposes
- B60R13/08—Insulating elements, e.g. for sound insulation
- B60R13/0815—Acoustic or thermal insulation of passenger compartments
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/40—Layered products comprising a layer of synthetic resin comprising polyurethanes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
- B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
- B32B3/266—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/10—Properties of the layers or laminate having particular acoustical properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/10—Properties of the layers or laminate having particular acoustical properties
- B32B2307/102—Insulating
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- Acoustics & Sound (AREA)
- Engineering & Computer Science (AREA)
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- Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
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Abstract
The invention relates to a conch bionic gradient porosity micro-structure automobile inner front wall acoustic bag structure, which comprises a hard layer porous material layer, a micro-structure material layer, an impermeable layer or an elastic solid layer, a micro-structure material layer and a soft layer porous material layer, wherein the hard layer porous material layer and the soft layer porous material layer are material layers with porosity gradient structures, the impermeable layer adopts a conch bionic resonance sound absorption structure, the impermeable layer comprises a middle impermeable layer main body part I and conch bionic structure parts II on two side surfaces, a plurality of uniformly distributed cavity openings are formed in the conch bionic structure parts II, a plurality of spiral cavity chambers sequentially arranged in a progressive mode are arranged in the cavity openings, the cavity chambers are communicated through chamber communicating pipes extending out of each cavity chamber, and the sound absorption material layer is laid on the inner surface of each cavity chamber; and a microstructure material layer is respectively added between the hard layer porous material layer and the impermeable layer and between the soft layer porous material layer and the impermeable layer, and adopts a negative Poisson's ratio inward-concave triangular structure. The invention effectively improves the sound absorption and insulation performance and can improve the crashworthiness of the front wall plate when the front cabin of the automobile is collided.
Description
Technical Field
The invention relates to the field of automobile noise reduction, in particular to an inner front wall acoustic bag structure of an automobile with a gradient porosity microstructure based on conch bionics.
Background
Nowadays, automobiles become one of the most important vehicles in every person's life, and increasingly higher demands are made on the acoustic quality of automobiles. The automobile engine is one of main sources of automobile noise, the automobile front wall panel is a main automobile part for blocking noise in an engine compartment from being transmitted to a passenger compartment, and the automobile inner front wall is one of the most important acoustic packages with the largest sound absorption and insulation amount in the whole automobile.
At present, chinese patent publication No. CN 106113841 a discloses a sound-insulating automobile front wall, which is manufactured to have good sound-insulating properties and foam adhesion properties in view of sound insulation and foam adhesion; chinese patent publication No. CN 108891106 a discloses a structure and a manufacturing process of a sound-insulating and sound-absorbing front wall, which achieves the effects of sound absorption and noise reduction by wrapping materials such as PET sound-absorbing cotton, EVA heavy coating, sound-insulating and vibration-damping plate, etc. outside the front wall panel; chinese patent publication No. CN 109353101A discloses an inner front wall sound insulation pad for high frequency squeaking of automobiles, which overcomes the shortcoming of air permeability of sound-absorbing materials by adding an airtight sound insulation film, and improves the emissivity of sound pressure on the surface of the material and the sound insulation performance by reasonably designing and matching the impedance change among multiple layers of materials; chinese patent publication No. CN 109483962 a discloses a multi-layered sandwich composite structure and an automotive dash panel using the same, which mainly comprises an upper top plate, a first sandwich body and a middle partition plate, thereby improving structural rigidity and strength, bending resistance, penetration resistance and non-coplanar collision resistance; chinese patent with publication number CN 109484326A discloses enclose before car and give sound insulation and fill up and car, through setting up two cotton layers of group, PU layer and EVA layer, has effectively promoted the sound insulation effect, has also reduced the whole weight that gives sound insulation simultaneously and fills up, has strengthened the durability.
The design of the automobile front wall in the above patent does not relate to the improvement of the whole sound absorption and insulation performance of the inner front wall by considering the sound absorption performance of a passenger cabin through the design of the material structure. The automobile is guaranteed that the thickness and the quality of the inner front wall of the automobile are certain, and how to improve the sound absorption and insulation performance of the automobile through the structural design of materials of each layer of the inner front wall acoustic bag is the key illustration of the patent.
Disclosure of Invention
The invention aims to provide an automotive inner front wall acoustic package structure based on a conch bionic gradient porosity microstructure aiming at the defects in the prior art, wherein the automotive inner front wall acoustic package structure effectively improves the acoustic performance of an acoustic packaging material on the premise of not changing the thickness of the material by utilizing the gradient change of the porosity of the acoustic material; the micro-structure material is added into the inner front wall acoustic bag structure, so that the overall sound absorption and insulation performance of the inner front wall acoustic bag structure can be improved, and the collision resistance of the front wall plate can be improved when the front cabin of the automobile collides; the sound absorption and insulation performance is effectively improved by adding the bionic structure of the conch to an impermeable layer or an elastic solid layer in the middle of the inner front wall acoustic bag.
The invention aims to realize the aim, and the front wall acoustic bag structure in the vehicle based on the conch bionic gradient porosity microstructure comprises a hard layer porous material layer, a microstructure material layer, an impermeable layer or an elastic solid layer, the microstructure material layer and a soft layer porous material layer, wherein the hard layer porous material layer and the soft layer porous material layer are material layers with porosity gradient structures, the impermeable layer adopts a conch bionic resonance sound absorption structure, the impermeable layer comprises a middle impermeable layer main body part I and conch bionic structure parts II on two side surfaces, the conch bionic structure parts II are provided with a plurality of uniformly distributed cavity openings, a plurality of cavity chambers which are spirally arranged in sequence are arranged in the cavity openings, the cavity chambers are communicated through chamber communicating pipes extending out of each cavity chamber, and the inner surfaces of the cavity chambers are paved with sound absorption material layers; a microstructure material layer is added between the hard layer porous material layer and the impermeable layer, a microstructure material layer is added between the soft layer porous material layer and the impermeable layer, and the microstructure material layer adopts a negative Poisson's ratio inward concave triangular structure.
The hard layer porous material layer is a material layer with a porosity gradient structure, and when the thickness of the hard layer porous material layer is less than 3mm or approximately equal to 3mm, the porosity gradient structure with the porosity arranged in sequence from small to large is adopted; when the thickness of the hard layer porous material layer 1 is larger than 3mm, a porosity gradient structure with the porosity arranged from large to small is adopted.
The soft layer porous material layer is a material layer with a porosity gradient structure, and the porosity gradient structure is arranged from large to small and then to large.
The invention has the advantages and technical effects that:
1. according to the invention, the porosity of the front wall hard layer porous material in the automobile is arranged from small to large (when the thickness of the material is less than 3mm or approximately equal to 3 mm), and the porosity of the soft layer porous material is arranged from large to small to large, so that the forward sound absorption performance and the reverse sound absorption performance of the acoustic packaging material can be effectively and obviously improved on the premise of not changing the thickness of each layer of material.
2. According to the invention, the bionic structure of the conch is added to the impermeable layer or the elastic solid layer in the middle of the inner front wall acoustic bag to form a resonance sound absorption structure with extremely strong sound absorption and insulation performance on multiple frequencies, so that the sound absorption and insulation performance of the whole inner front wall is effectively improved.
3. According to the invention, the microstructure material is added between the hard layer porous material and the impermeable layer (or the elastic solid) and between the soft layer porous material and the impermeable layer (or the elastic solid) of the front and inner wall acoustic bag structure, so that the integral sound absorption and insulation performance of the front and inner wall acoustic bag structure can be improved, and the collision resistance of the front wall plate can be improved by utilizing the negative Poisson's ratio mechanical property of the microstructure material when the front cabin of an automobile is collided.
Drawings
Fig. 1 is an overall structure diagram of a front wall acoustic package in an automobile according to the present invention.
FIG. 2 is a structural diagram of a hard layer porous material layer with a gradient porosity structure according to the present invention.
FIG. 3 is a graph of sound absorption versus frequency curves for a hard layer porous material layer of the present invention using a single porosity versus a gradient porosity.
Fig. 4 is a structural view of a soft layer porous material layer having a gradient porosity structure according to the present invention.
Fig. 5 is a graph comparing the sound absorption coefficient versus frequency curves for a soft layer porous material layer of the present invention using a single porosity versus a gradient porosity.
FIG. 6 is a sectional view of the structure of the biomimetic structure of conch in the impermeable layer of the present invention.
FIG. 7 is a perspective view of the projection from FIG. 6A according to the present invention.
FIG. 8 is a sectional view of the structure of the anti-seepage layer (or elastic solid) adopting the conch bionic structure.
Fig. 9 is a three-dimensional structure diagram of a negative poisson's ratio concave triangular microstructure material in a microstructure material layer of the invention.
FIG. 10 is a graph comparing sound absorption coefficient versus frequency curves for a hard layer porous material layer and a barrier layer with and without a microstructured material layer in accordance with the present invention.
Fig. 11 is a graph comparing insertion loss versus frequency curves for a barrier layer of the present invention and a soft layer porous material layer with and without a microstructured material layer.
Detailed Description
Specific embodiments of the present invention are described in detail below with reference to the accompanying drawings:
enclose acoustics package structure before in current car mainly divide into three layers: a hard layer porous material, a barrier layer (or an elastic solid), and a soft layer porous material. The hard layer porous material and the soft layer porous material of the front porous material layer and the back porous material layer are both a single-layer material, namely, a single-porosity structure. The single-layer material has a single pore structure, and a sound absorption coefficient-frequency curve of the single-layer material has wave crests and wave troughs, so that the sound absorption coefficient of the single-layer material with single property is larger at the peak frequency position in a wider frequency domain, and the sound absorption coefficients of other frequencies are smaller.
Shown in figure 1: the hard layer porous material and the soft layer porous material of the automobile inner front wall structure both adopt a gradient porosity structure formed by compounding a plurality of single-layer materials, and the gradient porosity structure has better sound absorption coefficient in a wider frequency domain than a single porosity structure.
The main function of the acoustic enclosure of the automobile interior front wall is to block the transmission of engine compartment noise to the passenger compartment and to absorb the passenger compartment noise. The front wall structure in the automobile is designed by taking the sound absorption performance and the sound insulation performance in the forward direction (the sound source is positioned in an engine compartment) and the sound absorption performance in the reverse direction (the sound source is positioned in a passenger compartment) as targets. The forward sound absorption performance of the acoustic bag of the front wall in the automobile is mainly related to the part in front of the impermeable layer, namely the hard layer porous material; the sound insulation performance of the acoustic bag of the front wall in the automobile is mainly related to the impermeable layer and the part behind the impermeable layer, namely the impermeable layer and the soft layer porous material; the reverse sound absorption performance of the acoustic bag of the front wall in the automobile is mainly related to the part behind the impermeable layer, namely the soft porous material.
Fig. 1 is a general structural view of a front acoustic bag in an automobile according to the present invention. An acoustic bag structure of a front wall in an automobile comprises a hard layer porous material layer 1, a microstructure material layer 2, an impermeable layer (or an elastic solid layer) 3, a microstructure material layer 4 and a soft layer porous material layer 5.
The hard layer porous material layer 1 is a material layer with a porosity gradient structure, and when the thickness of the hard layer porous material layer 1 is less than 3mm or approximately equal to 3mm, the porosity gradient structure with the porosity arranged in sequence from small to large is adopted; when the thickness of the hard layer porous material layer 1 is larger than 3mm, a porosity gradient structure with the porosity arranged in sequence from large to small is adopted; it compares in single porosity structure, can improve full-range sound absorption performance.
Fig. 2 is a structure diagram of a hard layer porous material layer with a gradient porosity structure, wherein the hard layer porous material layer 1 sequentially comprises 1-1 layer, 1-2 layers and 1-3 layers from left to right, and the 1-1 layer, 1-2 layers and 1-3 layers are hard layer porous material layers with porosities arranged from small to large or from large to small.
Taking the structure of PET + EVA + PU as an example, the hard layer porous material layer (PET) of the first group (comparison group) has a single porosity of 0.7 and a thickness of 3 mm; gradient porosity of hard layer porous material layer (PET)1 of the second group (experimental group): 1-1 layer 0.3, 1-2 layers 0.7 and 1-3 layers 0.8, wherein the thickness of the materials of 1-1 layer, 1-2 layers and 1-3 layers is 1mm, the total thickness is 3mm, and the EVA and PU parameters in the two groups are kept consistent. FIG. 3 is a comparison graph of the forward sound absorption coefficient-frequency curves of two groups of structures under a 0-78 degree diffusion sound field, and it can be seen from the graph that in the 4000-10000Hz frequency band, when the hard layer porous material adopts a gradient porosity structure, the sound absorption coefficient is obviously improved compared with that of a single porosity structure, and the sound absorption effect is better.
The soft porous material layer 5 is a material layer with a porosity gradient structure, and the porosity gradient structure is arranged from large to small and then large.
For the design of the porosity gradient structure of the soft layer porous material, the forward sound absorption performance and the reverse sound absorption performance are considered at the same time; if the arrangement sequence of the porosity from large to small is adopted, the reverse sound absorption coefficient of the gradient porosity structure is worse than that of the single porosity; if the arrangement sequence of the porosity from small to large is adopted, the positive sound absorption coefficient of the gradient porosity structure is worse than that of the single porosity; when the porosity gradient structure with the porosity arranged from large to small to large is adopted, the sound absorption coefficient in the forward direction can be ensured to be good, and the sound absorption coefficient in the reverse direction can be obviously improved. Here, for the gradient porosity structure, the larger the difference of the porosities of the materials of each two layers is within a certain range, the more remarkably the reverse sound absorption coefficient is improved.
Fig. 4 is a structural diagram of a soft porous material layer 5 with a gradient porosity structure, wherein the soft porous material layer 5 sequentially comprises 5-1 layers, 5-2 layers, 5-3 layers, 5-4 layers and 5-5 layers from left to right, and the 5-1 layers, 5-2 layers, 5-3 layers, 5-4 layers and 5-5 layers are soft porous material layers with the porosity arranged from large to small to large.
Taking a PET + EVA + PU structure as an example, the soft layer porous material layer (PU) of the first group (a control group) has a single porosity of 0.9 and a thickness of 25mm, the soft layer porous material layer (PU)5 of the second group (an experimental group) has a gradient porosity of 5-1 layer 0.98, 5-2 layer 0.9, 5-3 layer 0.82, 5-4 layer 0.9 and 5-5 layer 0.98, the material thickness of each gradient of 5-1 layer, 5-2 layer, 5-3 layer, 5-4 layer and 5-5 layer is 5mm respectively, and the total thickness is 25mm, so that the parameters of the PET and the EVA materials of the two groups are kept consistent.
FIG. 5 is a comparison graph of reverse sound absorption coefficient-frequency curves of two groups of structures under a 0-78 ℃ diffusion sound field, and it can be seen from the graph that in the frequency range of 3000-10000Hz, when the soft layer porous material adopts a gradient porosity structure, the sound absorption coefficient is obviously improved compared with that of a single porosity structure, and the sound absorption effect is better.
FIG. 6 is a sectional view of a conch structure. When the ears of people are tightly attached to the openings of the conchs, the 'sea sound' is often heard; in fact, this is not the real sea sound, i.e. the conch has not recorded the sea sound. The internal part of the conch is provided with a large cavity with a small opening, and the internal space is bent and bent to form a physical structure which is easy to cause resonance; the structure has a natural frequency that amplifies the acoustic resonance of the corresponding frequency in air, which is what we hear like the sound of the sea.
Fig. 7 and 8 show: the anti-seepage layer 3 is of a conch bionic resonance sound absorption structure and is used for improving the sound absorption and insulation performance of a front wall in an automobile, the anti-seepage layer comprises a middle anti-seepage layer main body part I and conch bionic structure parts II on two side faces, a cross section of an anti-seepage layer structure A-A of the conch bionic structure is shown in figure 8, a plurality of uniformly distributed cavity openings 3-1 are formed in the conch bionic structure parts II, a plurality of spiral cavity chambers 3-2 which are sequentially arranged in a progressive mode are formed in the cavity openings 3-1, the cavity chambers 3-2 are communicated through chamber communicating pipes 3-3 extending out of each cavity chamber, and sound absorption material layers are laid on the inner surfaces of the cavity chambers 3-2. When sound waves enter from the opening 3-1 of the cavity, resonance is generated between the sound waves with the same frequency as the natural frequency of the sound cavity and the cavity, and the sound-absorbing material layer laid on the surface of the cavity absorbs the sound waves, so that the structure has strong consumption close to f0Sonic energy of frequency. By adopting the arc structure of the conch, the most different natural frequencies f can be obtained by the smallest area0The hollow cavity structure can absorb all the noise in a certain frequency range outside, and extremely high sound absorption and insulation performance is achieved. The formula of the resonance frequency is:
wherein c is the sound velocity, S is the sectional area of the cavity opening 3-1, d is the diameter of the cavity opening 3-1, l is the length of the cavity opening 3-1, and V is the volume of the cavity chamber 3-2.
A microstructure material layer 2 is added between the hard layer porous material layer 1 and the impermeable layer 3, a microstructure material layer 4 is added between the soft layer porous material layer 5 and the impermeable layer 3, and the microstructure material layers 2 and 4 adopt a negative poisson ratio concave triangular structure (as shown in fig. 9).
Taking a PET + EVA + PU structure as an example, a microstructure material layer 2 with the thickness of 2mm is added between PET and EVA, and FIG. 10 is a comparison graph of forward sound absorption coefficient-frequency curves of two groups of structures under a 0-78-degree diffusion sound field. Fig. 10 shows that the sound absorption performance of the inner front wall at the frequency range of 2000-10000Hz can be remarkably improved by adding a layer of microstructure material 2 between the hard layer porous material layer 1 and the impermeable layer 3.
Taking a PET + EVA + PU structure as an example, a microstructure material layer 2 with the thickness of 2mm is added between the EVA and the PU, and FIG. 11 is a graph showing the comparison of insertion loss-frequency curves of two groups of structures under a diffusion sound field of 0-78 degrees. Fig. 11 shows that a layer of microstructure material 4 is added between the soft porous material layer 5 and the impermeable layer 3, so that the full-frequency sound insulation performance of the inner front wall can be remarkably improved.
The addition of the microstructure material layers 2 and 4 can improve the overall acoustic performance of the inner front wall, and can also significantly enhance the crashworthiness of the inner front wall of the automobile by utilizing the mechanical property of the negative Poisson ratio.
Claims (3)
1. The utility model provides a preceding acoustics package structure of enclosing in car based on marine snail is bionical gradient porosity microstructure which characterized in that: the sea snail sound absorption structure comprises a hard layer porous material layer, a microstructure material layer, an impermeable layer or an elastic solid layer, a microstructure material layer and a soft layer porous material layer, wherein the hard layer porous material layer and the soft layer porous material layer are material layers with porosity gradient structures, the impermeable layer adopts a sea snail bionic resonance sound absorption structure, the impermeable layer comprises a middle impermeable layer main body part I and sea snail bionic structure parts II on two side surfaces, a plurality of uniformly distributed cavity openings are formed in the sea snail bionic structure parts II, a plurality of spiral cavity chambers which are sequentially distributed in a progressive mode are arranged in the cavity openings, the cavity chambers are communicated through chamber communicating pipes extending out of each cavity chamber, and the sound absorption material layer is laid on the inner surface of each cavity chamber; a microstructure material layer is added between the hard layer porous material layer and the impermeable layer, a microstructure material layer is added between the soft layer porous material layer and the impermeable layer, and the microstructure material layer adopts a negative Poisson's ratio inward concave triangular structure.
2. The automotive inner front wall structure based on the conch bionic gradient porosity microstructure is characterized in that: the hard layer porous material layer is a material layer with a porosity gradient structure, and when the thickness of the hard layer porous material layer is less than 3mm or approximately equal to 3mm, the porosity gradient structure with the porosity arranged in sequence from small to large is adopted; when the thickness of the hard layer porous material layer is larger than 3mm, a porosity gradient structure with the porosity arranged from large to small is adopted.
3. The automotive inner front wall structure based on the conch bionic gradient porosity microstructure is characterized in that: the soft layer porous material layer is a material layer with a porosity gradient structure, and the porosity gradient structure is arranged from large to small and then to large.
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| CN113123261A (en) * | 2021-05-12 | 2021-07-16 | 中南大学 | Bionic sound absorption structure based on conch cavity structure and sound absorption unit plate thereof |
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| CN109353101A (en) * | 2018-10-18 | 2019-02-19 | 上汽大众汽车有限公司 | It is a kind of for automobile high frequency utter long and high-pitched sounds in preceding wall sound-isolation pad |
| CN109686354A (en) * | 2018-12-28 | 2019-04-26 | 西安交通大学 | A kind of spiral aperture basis of dual porosity rate sound absorber and its application |
| CN109707059A (en) * | 2018-12-28 | 2019-05-03 | 西安交通大学 | A kind of gradient is cracked basis of dual porosity rate sound absorber and its application |
Cited By (1)
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| CN113123261A (en) * | 2021-05-12 | 2021-07-16 | 中南大学 | Bionic sound absorption structure based on conch cavity structure and sound absorption unit plate thereof |
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